22308213 has 4 divisors (see below), whose sum is σ = 29744288. Its totient is φ = 14872140.

The previous prime is 22308211. The next prime is 22308217. The reversal of 22308213 is 31280322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22308213 - 2¹ = 22308211 is a prime.

It is a super-3 number, since 3×22308213³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22308213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22308211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3718033 + ... + 3718038.

It is an arithmetic number, because the mean of its divisors is an integer number (7436072).

Almost surely, 2^22308213 is an apocalyptic number.

It is an amenable number.

22308213 is a deficient number, since it is larger than the sum of its proper divisors (7436075).

22308213 is an equidigital number, since it uses as much as digits as its factorization.

22308213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7436074.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 22308213 is about 4723.1571009231. The cubic root of 22308213 is about 281.5063921729.

Adding to 22308213 its reverse (31280322), we get a palindrome (53588535).

The spelling of 22308213 in words is "twenty-two million, three hundred eight thousand, two hundred thirteen".